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vacabin
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# Posted: 24 May 2013 11:10am
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Hi guys I have aquired a large amount of foil faced foam panels for free was wondering would it be worth the effort to cut and use between the studs on my cabin build trying to keep cost down
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Sustainusfarm
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# Posted: 24 May 2013 11:50am
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I have seen it done! Try searching on here for that...
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GomerPile
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# Posted: 24 May 2013 12:07pm
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cut it 1/2 inch small and fill the gap with foam in a can to make an air tight wall. If you can put an inch or two on the outside of the wall you can eliminate thermal bridging thru your wall studs.
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creeky
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# Posted: 26 May 2013 09:43am
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got any spare panels. lol
You can also put them overtop of the studs inside the building. they are a bit fragile (what depth? 1/2", 1"...). so maybe drywall over that. this also gives you a vapour barrier.
Remember, if you put them on the exterior of the building they act as a vapour barrier. so you do need to be careful that there is a breathable plane or you might have mold/rot issues.
breathable plane. that might be a new expression.
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ICC
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# Posted: 26 May 2013 05:52pm - Edited by: ICC
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Quoting: creeky Remember, if you put them on the exterior of the building they act as a vapour barrier. so you do need to be careful that there is a breathable plane or you might have mold/rot issues.
Not to worry. You just have to do it the right way. (I can not imagine how you would make a practical wall that breathed without introducing undesirable factors. )
The solution is actually easy. The trick with exterior foam is to use enough foam R-value on the exterior. If the temperature of the interior of the wall is kept above the dew point there will be no condensation. What is enough exterior foam R-value is determined by the climate zone. The colder the zone the more R-value needed for the foam. And then there is NO interior vapor barrier used at all. No use of vinyl wallpaper either.
Info on climate zones and the amount of foam needed is in the IRC and can be found with Google on a number of websites.
For that matter, installing foam IN the bays one should follow the same thickness rule. You could still end up with condensation in the wall if the foam in there was insufficient R-value. The foam will still act like a vapor barrier on the outside. So same rules if doing foam in the bays. Spray foam installers will spray enough thickness to prevent problems with moisture.
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vacabin
Member
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# Posted: 27 May 2013 07:38am
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Thanks for all the help guys.My plans may have changed just got my hands on some 4x8 sheets of foam looks like the panels they use for walk in freezer these sheets are 4 inches thick should have plenty of r value.
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